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' Leners Param No. 76,044, dared March 31, ieee.

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Be it known" thatv we, JAMES BRAMBLE und HUGH LNI. DnIHL, oi' Fort Wayne, in the county of Allen, and State of Indiana, have invented a new and improved Piano-Stool; and we do hereby declare that the following is a. full, clear, and exact desbription thereof, which will enable those skilled in the art to make and use the same,y reference being had to the accompanying drawings, forming'part of this specification.` v

This invention consists in the application ofthe principle of hydrostatics for elevating or lowering the seat of a piano-stool, whereby the performer may be raised or lowered on the seat, without rising from it, by the action of the foot, as will hereinafter be more fully explained. i

.The drawing represents a sectional elevation of a. piano-stool constructed andv operated according to our invention.

A is the stand or column. 1B' is the seat. C represents the legs-ot` the stool. D is a Water-chamber or .liquid-reservoir, beneath the coluinn A, and enclosed'thereby4 This reservoir consists'of a longitudinal section of a Water-tight metallic cylinder. E is a central tube, which is'attnched to the reservoir, which tube is accurately bored out, and toiwhich thespindle er plunger F oitlie sentis itted. g represents packing on the end of the plunger. H is a bent lever, by which aforce-pump is operated. I is the plunger ci' the force-pump, andV J is the pump-cylinder. c is packing -on the punipplunger. lisa valve, which admits water into the pump when the plunger is raised. This force-pump, and the pipes and valves by which the water is admitted to and withdraw-n from the tube E for operating the seat, are confined in and attachedfto a central core, m, in the reservoir D.` n indicates the pipe through `which the water is forced from the force-pump. O represents the pipe through which the water is discharged back into the reservoir. p is astop-valvc, which is pressed to its seat by a spiral spring, q. This valve can rise only when the force-pump plunger descends, as seen. 7 is a valve connected with the dischargepipe o. This valve is pressed .upward to its -seat by aspiral spring, s, and it can leave its seat only when the end, t, of the lever'H operates upon its stem u. v isi-a. foot-piece on the lower end of the lever H. wis a spring, which hears against the under side ofthe lever H, with a constant pressure to keep it up and in the position as seen in the drawing. The 'lever H is connected with the plunger of the force-pump by ajointed connection, as seen at a). The t'ulcrum of the lever is ,on the stud y.

The operation will be readily understood fromv the drawing. For raising the seat of 'the stool the performer presses with the foot upon the foot-piece c, which forces down the plunger ofthe force-pump, and forces water (or whatever liquid may be contained lin the reservoir) into the tube E. Water being non-elastic, the least moveme/nt ofthe plunger forces up the valve p, and forces water into the tube E through the pipes n and z, and raises the seat by the pressure on the end ot' the spindle or plunger F. This may be done by the most steady and gentle motionf When it is desired to lower the seat, the foot-piece c may be raised by the heel of the performer. I lVhen this is done, the end, t,vof the lever H'will strike the top of the vulve-stem u, and force thevalve rfrom its seat, when the water confined in the tube E' will escape back into the reservoir. It'will thus be seen that the height of the seat may be controlled by the gerntlestmotion ofthe foot oi` the performer.

We do not confine ourselves to the particular arrangement shown and described for controlling the height oi' a piano-stool seat by the pressure of water or other duid. The details may, per-haps, be somewhat varied and the saine result be produced. i

Having thus described our invention, we claim as new, and desire to secure by Letters Patent- Controlling the height ofthe seat of a piano-stool by hydrostatic pressure, substantially as described.

JAMES BRAMBLE", HUGH M. DEIHL.

Witnesses:

QBYnoN Davis,

W. A. Dalers. 

